Morfologia do sistema reprodutor masculino e dos espermatozóides de duas espécies de Ichneumonidae (Hymenoptera: Ichneumonoidea) / Male reproductive system and sperm morphology in two Ichneumonidae (Hymenoptera: Parasitic)

AUTOR(ES)

Jane Carla Soares Moreira

DATA DE PUBLICAÇÃO

2007

RESUMO

The male reproductive system of the Lymeon dieloceri and Myschocyttarus atramentarius parasitoids is formed by a pair of testes with one folicles each, a pair of accessory glands, a pair of vasa deferentia and one ejaculatory duct. The vasa deferentia are thin, long, without characteristic dilatation of the seminal vesicle, and they get in the base of the testicular lobule. The accessory glands open in the vas deferens and, in Lymeon dieloceri they are oval shape and in M. atramentarius parasitoid, they are spherical. In both Ichneumonidae the spermatozoa are similar to those ones described for other Hymenoptera, with : (1) the acrosome formed by the acrosomal vesicle covering the perforatorium, which has its base inserted in a gap located in the nucleus point; (2) thin and long nucleus with a electron-dense chromatin; (3) an electron-dense centriole adjunct located between the nucleus and one of the two mitochondrial derivatives; (4) axoneme with 9+9+2 microtubes arrangement; (5) two long mitochondrial derivatives with peripheral cristae and; (6) two accessory bodies located between the two mitochondrial derivatives and the axoneme. They also present structural characteristics only common to the parasitic wasps, as a layer of extracellular material involving the acrosome and one region of the nucleus and the axoneme accessory microtubes ending before the other ones. However, the male reproductive system and the sperm presented morphologic characteristics that allowed differentiating themselves, as the form of the accessory glands and the mitochondrial derivatives. In L. dieloceri, the glands have an oval shape and the mitochondrial derivatives are symmetrical, no longer, in the M. atramentarius parasitoid, the glands have a spherical shape and asymmetrical derivatives. Therefore, this work shows that, in Hymenoptera, the male reproductive system and the spermatozoa supply morphologic characters that can be used in phylogenetic analyses in different taxonomic levels.

ASSUNTO(S)

hymenoptera ichneumonidae hymenoptera morfologia espermatozóide spermatozoa ichneumonidae

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